<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <!-- import CSS -->
    <link rel="stylesheet" href="https://cdn.staticfile.org/element-ui/2.15.9/theme-chalk/index.css">
</head>
<body>
<div id="app">
    <el-page-header style="background-color: #0096dc;color: white;line-height: 60px"
                    @back="goBack" content="添加轮播图页面">
    </el-page-header>
    <!-- action 设置文件上传的路径
         limit 设置上传图片的数量
         name 设置上传文件的参数名称-->
    <el-upload
            action="/upload"
            limit = "1"
            name = "picFile"
            list-type="picture-card"
            :on-preview="handlePictureCardPreview"
            :on-success = "handleSuccess"
            :on-remove="handleRemove">
        <i class="el-icon-plus"></i>
    </el-upload>
    <el-dialog :visible.sync="dialogVisible">
        <img width="100%" :src="dialogImageUrl" alt="">
    </el-dialog>
    <input type="text" placeholder="图片描述" v-model="b.des">
    <el-button type="success" @click="add()">上传图片</el-button>
</div>
</body>
<!-- 引入axios 和 vue框架文件 -->
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
<!-- import Vue before Element -->
<script src="https://cdn.staticfile.org/vue/2.6.14/vue.min.js"></script>
<!-- import JavaScript -->
<script src="https://cdn.staticfile.org/element-ui/2.15.9/index.min.js"></script>
<script>
    let v = new Vue({
        el: '#app',
        data: function () {
            return {
                dialogImageUrl: '',
                dialogVisible: false,
                b:{des:"",url:""}
            }
        },
        methods:{
            add(){
                if (v.b.url==""){
                    alert("请选择上传的图片！")
                    return;
                }
                /* 发出异步请求 */
                axios.post("/insert",v.b).then(function () {
                    alert("上传完成！")
                    location.href = "/";
                })
            },
            handleSuccess(response,file,fileList){
                /* response 表示服务器响应的数据 图片Url
                *  file 表示上传成功的文件对象
                *  fileList 上传多个图片时会用到 是一个数组里面装多个file对象 */
                console.log(response);
                v.b.url = response;
            },
            goBack(){
                //返回上一页面
                history.back();
            },
            handleRemove(file, fileList) {
                v.b.url = "";
                /* file.response 代表上传文件成功时 服务器响应的内容 图片路径 */
                console.log(file.response, fileList);
                /* 发出删除图片的请求 */
                exios.get("/remove?url="+file.response).then(function () {
                    console.log("删除完成!");
                })
            },
            handlePictureCardPreview(file) {
                console.log("")
                this.dialogImageUrl = file.url;
                this.dialogVisible = true;
            }
        }
    })
</script>
</html>